The situation when a spectrum exists only in the form of a paper record and contains valuable unprocessed information is not that rare. In the case of broadband spectra with a rich information content it is very desirable to convert such spectra into a digital form that will be amenable for use with contemporary packages for graphical assignment., {\bf 233}, 231-243 (2005).} \vspace{0.2cm} The RAD spectrum of the H$_2$O$\cdots$HF hydrogen bonded dimer recorded in the 1980's at Nizhny Novgorod is an example of such a valuable legacy spectrum. Only a small proportion of the lines in this spectrum have been assigned and measured., {\bf 241}, 124-135 (2007).} A special software package has been written to convert the original spectrum from many strip chart records into a unified, calibrated digital spectrum, which covers the frequency region 182-352 GHz and 11 succesive $J+1\leftarrow J$ transitions. The package is described in detail, is expected to be of universal applicability, and has been made available on the PROSPE website. http://info.ifpan.edu.pl/{\~{ }}kisiel/prospe.htm.} Initial results concerning the analysis of this spectrum are reported, and it is aimed to considerably improve the understanding of the internal dynamics in H$_2$O$\cdots$HF over that reached earlier on the basis of the cm-wave rotational spectrum., {\bf 381}, 419-442 (1982).}